Stability and Sensing Enhancement by Nanocubic CeO with {100} Polar Facets on Graphene for NO at Room Temperature.

Metal oxides with a polar surface interact strongly with polar NO molecules, thus facilitating sensitive detection of NO. In this work, the composites comprising graphene and cubic CeO nanoparticles with the {100} polar surface are prepared by a hydrothermal technique, and they exhibit fast response, excellent selectivity, stable recovery, and sensitive detection with a low detection limitation of 1 ppm for NO at room temperature. According to the first-principle calculations, the adsorption energy of NO on the CeO{100} polar surface is the most negative corresponding to the strongest interactions between them.

Octahedral SnO/Graphene Composites with Enhanced Gas-Sensing Performance at Room Temperature.

Although high-energy facets on metal oxides are usually active and preferred for gas sensing, it is difficult to expose them according to thermodynamics. In this work, nanocomposites of SnO and graphene are prepared by a hydrothermal method. The SnO nanoparticles change from a lance shape to an octahedral shape as the concentration of HCl in the solution is increased gradually from 6.

Enhanced Osseointegration of Hierarchically Structured Ti Implant with Electrically Bioactive SnO-TiO Bilayered Surface.

The poor osseointegration of Ti implant significantly compromise its application in load-bearing bone repair and replacement. Electrically bioactive coating inspirited from heterojunction on Ti implant can benefit osseointegration but cannot avoid the stress shielding effect between bone and implant. To resolve this conflict, hierarchically structured Ti implant with electrically bioactive SnO-TiO bilayered surface has been developed to enhance osseointegration.

Oxygen Vacancy Enhanced Gas-Sensing Performance of CeO/Graphene Heterostructure at Room Temperature.

Oxygen vacancies (O) as the active sites have significant influences on the gas sensing performance of metal oxides, and self-doping of Ce in CeO might promote the formation of oxygen vacancies. In this work, hydrothermal process is adopted to fabricate the composites of graphene and CeO nanoparticles, and the influences of oxygen vacancies as well as Ce ions on the sensing response to NO are studied. It is found that the sensitivity of the composites to NO increases gradually, as the proportion of Ce relative to all of the cerium ions is increased from 14.

Electrically bioactive coating on Ti with bi-layered SnO-TiO hetero-structure for improving osteointegration.

The potential for the use of electric stimulation to control cell behavior on a surface has been well documented. In terms of orthopaedic applications, there is a need to develop bioactive surfaces with a built-in electric field for clinically relevant materials, such as load-bearing titanium (Ti). In this work, a bi-layered SnO-TiO coating is fabricated via microarc oxidation and subsequent hydrothermal treatment to adjust the surface electrical properties for improving bioactivity.